Disregarding air resistance, what is the speed of a ball dropped from 12 feet just before it hits the ground? (use 1 ft = 0.30
m, and use g = 9.8 m/s2)
2.4 m/s
8.4 m/s
10.8 m/s
15.3 m/s

8.4 m/s

Explanation:

This described situation is related to vertical motion (free fall), with constant acceleration (acceleration due gravity), and in this case, the following formula will be useful:

(1)

Where:

Is the final velocity of the ball

Is the initial velocity of the ball (it was dropped)

is the acceleration due gravity

is the distance at which the ball hits the ground (taking into account , )

(2)

(3)

Finally:

an electric circuit